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						<h4>乳腺癌的病因</h4>
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						<p>乳腺癌的病因尚未完全清楚，研究发现乳腺癌的发病存在一定的规律性，具有乳腺癌高危因素的女性容易患乳腺癌。所谓高危因素是指与乳腺癌发病有关的各种危险因素，而大多数乳腺癌患者都具有的危险因素就称为乳腺癌的高危因素。据中国肿瘤登记年报显示：女性乳腺癌年龄别发病率0～24岁年龄段处较低水平，25岁后逐渐上升，50～54岁组达到高峰，55岁以后逐渐下降。乳腺癌家族史是乳腺癌发生的危险因素，所谓家族史是指一级亲属(母亲,女儿,姐妹)中有乳腺癌患者。近年发现乳腺腺体致密也成为乳腺癌的危险因素。乳腺癌的危险因素还有月经初潮早（<12岁），绝经迟（>55岁）；未婚，未育，晚育，未哺乳；患乳腺良性疾病未及时诊治；经医院活检(活组织检查)证实患有乳腺非典型增生；胸部接受过高剂量放射线的照射；长期服用外源性雌激素；绝经后肥胖；长期过量饮酒；以及携带与乳腺癌相关的突变基因。需要解释的是乳腺癌的易感基因欧、美国家做了大量研究，现已知的有BRCA-1、BRCA-2，还有p53、PTEN等，与这些基因突变相关的乳腺癌称为遗传性乳腺癌，占全部乳腺癌的5%～10%。具有以上若干项高危因素的女性并不一定患乳腺癌，只能说其患乳腺癌的风险比正常人高，中国妇女乳腺癌的发病率还是低的。</p>
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